Protective spring for boats and small craft



Dec. 5, 1944. LA B T 2,364Q081 PROTECTIVE SPRING FOR BOATS AND SMALL CRAFT "Filed June 6, 1959 2 Sfieets-Sheet 1 fig.

INVENTOR 'ATTOR NEYS 6.1?Lmmberi Dec. 5, 1944. p LAMBERT 2,364,081,

, PROTECTIVE SPRING FOR BOATS AND SMALL cRAF-T' Filed June 6, 1959 2 Sheets-Sheet 2 I NVEN TOR .FLaum/beii ATTORNYJ One. drawbacki ing of a bight of rope, "chair painter. yield, the rubber spring is so arranged that a Patented Dec. 5.1944 I" 1 i normomlvs PRING mmnoh'rsmnne 7 MALL CRAFTS ea er museum; Stockholm ,.Swetlen J Aipplication Juueidgi1939, SiariaLNonflliSSSi v I Ir SWQdemJuneeIM-IQEIS -Q 3 Myrimzention relatesuto anieiastie:dvioaptdubbenror." otherirlike highly 2: elastic::'=sub'"stanoe5= the principal iobiiectliohfwhichi is=to n1ake a jcrattT -iast to:landingistages dmthe like; or-iformooring boatsstop chai ng. andiideizi'ces iori makingi the-earrangeei ment fast to-ai landingzstageronthe like. Figures is an end" view of theedevicetshown in FigurewBa-l generally" m pumposewylmdridali 51 1 urelOiiS pertbfia sectioriaildfig tI-IeEIihesBr-" E steel springs have so rangenerally been usedi fi such sprimgs is However, thatthey. areiliabie -to break suddenly owing 'to fatigue orrevenrfaultymaterialg and therefore providein secure protection for the boati'l Altl ibu gh arr "elastic: rubber 'device will i n time lose ite -'elasticit'y,

given an opportunity to replacea too-oldrhbbb1 spring cby anew spring Iii-"order; however, to p avoid itoo greatriextensiorr of he rubber spring, this as combined wlth -a' stopp ng device consistme braneme attachedf-between'the-ends eithe -spring? Owing renderingunnecessary a'special boat protecting" like attached'tothetrubber sprirrgr Inprotective" that even a weak though quick pull on the painter 1 will' not jar the" poiiits"of"attachment of the In order to achieve this easy initial I'he drawings showvarious different forms of rubber springs and devices for attaching such corru gated banda' Figure il is aipian "wtof shown in Figure 13. Figure 1sa side view ot Vt two'fliitrubber rings' connected a rod.

' .tl ieaccompanying drawings, Figure 1 shows;

one fo'rm oftlfe inventidn according to whiclithe rope-2 will-I press'fthe loops *5fand-FS againsttwo diametrically opposedplaces 'l and fi on the inner" slight pull on the will cause ring jl to assumethb shape I Figure. 4'5 A" stronger'fipull f on the painter'Z twill cause the ring to'assume theshape p shown in Figure 5. The nature of this change pull on the painter will bend parts of the rubber in the shape of the rubber ring when the painter spring from their initial positions before the rubf her really begins to stretch.

painter" ShibIWli 1 springs and. protecting them from overstrain. 40 ertia of the massof the springmust first be over- Figure 1 is a plan view of a ring-shaped flat rubber spring attached to a painter. Figure 2 is a side'view of the rubber ringishown in Figure 1. Figure 3is a modification of therin'gs shown in p a come by the jerk before the spring begins to give, thus causing a jar at the point where the painter is attachedto the boat. The ring is more- .ove'rso dimensioned that the transition from.

Figures 1 and 2, inwhi-ch the inner edge is thinner light to stronger resistance will be as smooth as, than the outer and slightly displaced relatively to the plane through the outer edge of the ring.

. Figure 4 is a side view of the rubber ring shown in Figure 1, showing the ring slightly deformed possible, or so that it will closely correspond to by a pull on the painter. Figure 5 is a side view .50 to avoid the inner edges of the ring at the two of the rin gshown in Figure 1, showing the ring chain. Figure 'Tis a horizontal section along the places! and 8 bending to opposite sides of the ring and thus being strained more than necessary,

the ring is given such a shape that the bending moments acting on the inner edge at I and 8 line A--A in Figure 6. Figure .8 is a view of a will be directed towards the same side of the p sshapedzrubbenisprifrg providedtwithi clamps;

a boat chain. The rubber ring I is flexibly connected with the chain l3 by the bolts I2. of the V clamps ll,the chain l3 forming a bight l3 between the bolts I2.

In order to produce the desired resiliency in .the mooring rope or chain of the boat, the rubber spring can also be made fast to the landing stage or the buoy, the painter or chain of the boat being then made fast to the rubber spring. Figure 8 is a plan view of such an arrangement, and Figure 11 is a section along the line 3-3 in Figure 8. The rubber ring I" isheld by two clamps l4, each with two screw' bolts l5 and I6 between which the iron links I! are held. These links are connected by a stop chain I8 to limit the extension of the rubber ring. One of the links 11 is made fast to the landing stage or to the buoy, while the other link I 1 is used for making fast the painter or chain of the boat. To increase the spring action, two or more rubber rings may be superposed in the clamps M as shown in Figure 12.

Two or more rubber rings of for instance the type I, l, or I" can also be combined into an tially fiat rubber body formed into a'plurality of elastic band. Figure 15 thus shows two rings l connected by a rubber rod! 9.

The great initial resiliency of the rubber springs described above is mainly obtained by the inner edges of a more or less fiat ring being bent to one side by means of the loops of the painter or the clamps of the chain as the case may be. The same effect can also be obtained by making the rubber spring in the shape of a corrugated band which when pulled will first be more or less straightened out before the band really bev gins to become extended. Figures 13 and 14 show such a rubber band. The ends of the rubber band 20 are provided with holes 2| for attachment to a chain with clamps like II in Figure 6 or to a painter as in Figure 1. The band has two corrugations 22, which are partlystretched by the pull before the band itself is extended.

rings connected together in series by portions of the. rubber body, pulling loops embracing the inner edges of the outer rings, said rings having zones which on the initial application of tension to said pulling loops cause the ring to be bent from the inner edge outwardly prior to a stretching of the entire ring in the direction of the pull.

3. A shock absorber consisting of pull mem- "bers, a substantially flat ring of rubber connecting the pull members, the rubber ring having zones which on the initial application of tension to said pull members cause the ring to be bent from its inner edge outwardly then to a stretching of the entire ring in the direction of pull.

4. A shock absorber as claimed in claim 3, in which the cross section of the ringis wider radially than transversely.

5. A shock absorber as claimed in claim 3, in

which the cross section of the ring is more than two times wider in a radial direction than transversely thereof.

6. A shock absorber as claimed in claim 3, in which the cross section of the ring is wider radially than transversely and narrower at the inner than at the outer edge.

7. A shock absorber as claimed in claim 3, in which the ring has an inwardly diminishing thickness while the inner edge thereof is set 01f transversely from the outer edge.

8. A shock absorber comprising pull members, a substantially flat rubber body connecting the pull members and having at least one zone which is subjected first to a change in shape by being bent transversely of the plane of the rubber body on the initial application of tension to said pull members and prior to a stretching of the,

entire rubber body in the direction of pull.

GUSTAF PAUL LAMBERT. 

